262  Pharmacy  of  Liquid  Petrolatum.  { 
Am.  Jour.  Pharm. 
June,  1903. 
Mix  the  liquid  petrolatum  with  the  powdered  acacia  in  a  dry 
mortar,  add  4  fluidounces  of  water  all  at  once,  and  triturate  the  mix- 
ture until  a  perfect  emulsion  is  formed;  then  add  the  oil  of  winter- 
green  and  finally  enough  water  to  make  the  finished  product  measure 
I  pint. 
EMULSION  OF  UOUID  PETROLATUM,  WITH  HYPOPHOSPHITES. 
Iviquid  petrolatum,  ^iv 
Acacia,  powdered,  ^ij 
Calcium  hypophosphite,  grs.  330 
Potassium  hypophosphite,  grs.  1 10  . 
Sodium  hypophosphite,  grs.  no 
Oil  of  wintergreen,  minims  xxxij 
Water,  sufficient  to  make  Oi. 
Mix  the  liquid  petrolatum  with  the  powdered  acacia  in  a  dry 
mortar,  add  4  fluidounces  of  water  all  at  once,  and  triturate  the  mix- 
ture until  a  perfect  emulsion  is  formed;  then  add  the  oil  of  winter- 
green.  Dissolve  the  hypophosphites  in  6  fluidounces  of  water  and 
add  this  solution  to  the  emulsion,  finally  adding  enough  water  to 
make  the  finished  product  measure  I  pint. 
The  addition  of  vegetable  oils,  like  olive  oil  or  oil  of  sweet 
almond,  for  the  purpose  of  increasing  the  stability  of  the  emulsion, 
was  not  found  necessary,  although  a  number  of  samples  were  made 
varying  the  proportion  of  oil. 
Other  emulsifying  agents  were  also  tried,  as  a  mixture  of  equal 
parts  of  tragacanth  and  acacia,  tragacanth  alone,  glycerite  of  the 
yolk  of  egg,  casein,  mucilage  of  Irish  moss  and  mucilage  of  dextrin, 
N.  F. 
A  mixture  of  tragacanth  and  acacia,  using  the  proportions  sug- 
gested for  acacia  alone,  produced,  by  the  Continental  method,  a  very 
satisfactory  emulsion.  Tragacanth  alone  forms  a  perfect  emulsion, 
but  the  preparation  is  viscid  and  has  no  advantage  over  acacia. 
The  glyconin  makes  a  good-looking  preparation,  but  it  must  be 
prepared  by  the  English  method,  which  is  much  more  tedious  than 
the  Continental.  Casein,  when  made  soluble  by  the  addition  of  one- 
third  of  its  weight  of  sodium  bicarbonate,  also  forms  an  emulsion, 
but  it  has  not  remained  permanent,  while  neither  the  mucilage  of 
Irish  moss  nor  the  mucilage  of  dextrin  would,  when  used  alone, 
emulsify  the  liquid  petrolatum. 
The  conclusion  with  regard  to  emulsions  has  been,  therefore,  that 
